If you need to sign in to your account and you don't have your phone, try using one of the backup codes given to you when you enabled two-factor authentication. Each of your backup codes only works once.
If you don't have a working backup code handy, please contact Etsy Support by scrolling to the bottom of this page and clicking the contact link.
In the future, remember to keep your backup codes in a safe place. Learn more about your security settings.